Home | About Us | Contact Us


Koi Forum - Koi-Bito Magazine straight from Japan
Results 1 to 8 of 8

Thread: Proper type of concrete question

  1. #1
    Fry
    Join Date
    Apr
    Location
    Southern Arizona, near Tucson
    Posts
    4

    Proper type of concrete question

    I need to use concrete to create some forms. Specifically, I have a box made of concrete block for a section of a settlement chamber, and need to use concrete to change its interior shape to a cylinder, and the bottom to a vortex shape. The job is way too small to hire a professional gunite injection, so I am wondering if there isn't a proper mix of concrete that I can manually work the surface. Are there any experts out there that can advise me?

    Thanks!

    Regards,
    Todd

  2. #2
    Honmei ricshaw's Avatar
    Join Date
    Mar 2010
    Location
    Southern California
    Posts
    2,653
    I am not a concrete expert.

    Are you trying to "stucco" the inside of concrete block? or it sounds like you need to "pour" more concrete to make a cylinder with cone shape sloping bottom.

    If true, and not hiring a gunite professional, then you will need to build a form and fill with a concrete mixture (rock, sand, cement). A "six-sack" mixture is what I would use.

    You might consider using a section of large concrete pipe.


  3. #3
    Honmei ricshaw's Avatar
    Join Date
    Mar 2010
    Location
    Southern California
    Posts
    2,653
    I have a plastic water tank I will sell you cheap!


  4. #4
    Oyagoi yerrag's Avatar
    Join Date
    Jul 2013
    Location
    Manila, Philippines
    Posts
    1,792
    If you need a guide on setting up the cone, check out this video starting at around the 6 minute mark:
    https://youtu.be/39xT5xzNu3s

    There is a formula that you have to look for, from which you use to cut a piece of plastic to use to form the vortex bottom using concrete. Good luck. And when you find the formula, please post. I didn't get that far since it was something I have no pressing need for now.

  5. #5
    Fry
    Join Date
    Apr
    Location
    Southern Arizona, near Tucson
    Posts
    4
    Quote Originally Posted by yerrag View Post
    If you need a guide on setting up the cone, check out this video starting at around the 6 minute mark:
    https://youtu.be/39xT5xzNu3s

    There is a formula that you have to look for, from which you use to cut a piece of plastic to use to form the vortex bottom using concrete. Good luck. And when you find the formula, please post. I didn't get that far since it was something I have no pressing need for now.
    Thanks! That gave me a couple of good ideas, at the very least. I have to create a settlement chamber around 1000 gal total, so the 55 gal drum will not work for me. I am building 4 boxes from 4" wide concrete block, with common walls. The bottom portion will contain the vortex and the rest of the input/output is really the same as described in the YouTube video you found. I will use mortar with a product that I bought at HPI (Henry Products) to increase the 'stickiness' and strength of the mortar to form the vortex at the bottom. The idea of using a piece of PVC to smooth out the walls of the vortex was a good idea. I will use that. Then instead of the thin-set, I will simply epoxy paint the concrete surface.

    I was then planning on making the top half of the 'box' into a cylinder, the area above the vortex, but I am wondering it that is really necessary. The fluid motion created by the vortex may be sufficient so that the additional effort of making the top half cylindrical may not be necessary. Would love some opinions on this.

    I also like the idea of the uniseal. I will have to look for that product. I was hoping that the concrete around the 4" PVC might be sufficient, but probably not good enough.

    Thanks for the feedback!

    Regards,
    Todd

  6. #6
    Honmei ricshaw's Avatar
    Join Date
    Mar 2010
    Location
    Southern California
    Posts
    2,653
    Quote Originally Posted by yerrag View Post
    There is a formula that you have to look for, from which you use to cut a piece of plastic to use to form the vortex bottom using concrete. Good luck. And when you find the formula, please post. I didn't get that far since it was something I have no pressing need for now.
    Attached Thumbnails Attached Thumbnails Proper type of concrete question-cone_formula.jpg  

  7. #7
    Oyagoi yerrag's Avatar
    Join Date
    Jul 2013
    Location
    Manila, Philippines
    Posts
    1,792
    Quote Originally Posted by tpaulus3 View Post
    Thanks! That gave me a couple of good ideas, at the very least. I have to create a settlement chamber around 1000 gal total, so the 55 gal drum will not work for me. I am building 4 boxes from 4" wide concrete block, with common walls. The bottom portion will contain the vortex and the rest of the input/output is really the same as described in the YouTube video you found. I will use mortar with a product that I bought at HPI (Henry Products) to increase the 'stickiness' and strength of the mortar to form the vortex at the bottom. The idea of using a piece of PVC to smooth out the walls of the vortex was a good idea. I will use that. Then instead of the thin-set, I will simply epoxy paint the concrete surface.

    I was then planning on making the top half of the 'box' into a cylinder, the area above the vortex, but I am wondering it that is really necessary. The fluid motion created by the vortex may be sufficient so that the additional effort of making the top half cylindrical may not be necessary. Would love some opinions on this.

    I also like the idea of the uniseal. I will have to look for that product. I was hoping that the concrete around the 4" PVC might be sufficient, but probably not good enough.

    Thanks for the feedback!

    Regards,
    Todd
    You're welcome, Todd. And Richard, thanks for posting the formula. I hope I can use it someday soon.

  8. #8
    Fry
    Join Date
    Apr
    Location
    Southern Arizona, near Tucson
    Posts
    4
    Quote Originally Posted by yerrag View Post
    You're welcome, Todd. And Richard, thanks for posting the formula. I hope I can use it someday soon.
    I used the formulas yesterday and it worked well. Now I have to do the concrete work to see it turn into a vortex! So, it is starting to shape up into a real pond.
    Regards,
    Todd

Similar Threads

  1. Replies: 3
    Last Post: 09-28-2012, 12:15 PM
  2. Proper Quarentine KHV.
    By UP ALL NIGHT!! in forum Main Forum
    Replies: 1
    Last Post: 08-04-2009, 01:51 PM
  3. What is the proper etiquette???
    By keokoi in forum Main Forum
    Replies: 16
    Last Post: 04-14-2006, 05:21 PM
  4. Proper KOI measurement technique ????
    By keokoi in forum Main Forum
    Replies: 7
    Last Post: 12-26-2005, 05:32 PM
  5. proper fish measurement technique
    By joe bauer in forum Main Forum
    Replies: 1
    Last Post: 12-23-2005, 10:30 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Articles - Sitemap - FAQs and Rules

KB Footer Graphic
Straight from Japan... For the serious hobbyist!
All content and images copyright of: Koi-bito.com